ActiveMQ，为什么RedeliveryCounter在Ack之前关闭消费者时不会增加

Question

我的消费者在应用服务器中运行。这是我的ActiveMq配置：

optimizeAcknowledge=true  
optimizeAcknowledgeTimeOut=5000  
destination=queue.test.msg?consumer.prefetchSize=10  

发送10条消息后，＆＃34; Web控制台（http://localhost:8161/admin）＆＃34;可以看到3条消息不要Ack（使用optimizeAcknowledge），此时当我重新启动消费者服务器时，我再次收到3消息，RedeliveryCounter = 0。所以我不确定这是重传消息还是只是由制作人发送。

这个问题也可以在交易中找到。我运行测试类：org \ apache \ activemq \ RedeliveryPolicyTest.java，methoed：testRepeatedRedeliveryReceiveNoCommit。调试＆＃34; connection.close（）;＆＃34;并阻止它。消息的RedeliveryCounter也是＆＃34; 0＆＃34;。

问题：因此，当我确实确定邮件是否已重新发送时，我必须在消费者处理完邮件之后使用商店保存所有邮件的ID，并在消费者收到邮件时检查是否存在？

代码如下：

public void testRepeatedRedeliveryReceiveNoCommit() throws Exception {
    connection.start();
    Session dlqSession = connection.createSession(true, Session.SESSION_TRANSACTED);
    ActiveMQQueue destination = new ActiveMQQueue("TEST");
    MessageProducer producer = dlqSession.createProducer(destination);

    // Send the messages
    producer.send(dlqSession.createTextMessage("1st"));

    dlqSession.commit();
    MessageConsumer dlqConsumer = dlqSession.createConsumer(new ActiveMQQueue("ActiveMQ.DLQ"));

    final int maxRedeliveries = 4;
    for (int i=0;i<=maxRedeliveries +1;i++) {

        connection = (ActiveMQConnection)factory.createConnection(userName, password);
        connections.add(connection);
        // Receive a message with the JMS API
        RedeliveryPolicy policy = connection.getRedeliveryPolicy();
        policy.setInitialRedeliveryDelay(0);
        policy.setUseExponentialBackOff(false);
        policy.setMaximumRedeliveries(maxRedeliveries);

        connection.start();
        Session session = connection.createSession(true, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = session.createConsumer(destination);

        ActiveMQTextMessage m = ((ActiveMQTextMessage)consumer.receive(4000));
        if (i<=maxRedeliveries) {
            m.setRedeliveryCounter(1);
            System.out.println("Text:"+ m.getText());
            System.out.println("RedeliveryCounter:" + m.getRedeliveryCounter());
        } else {
            System.out.println("null on exceeding redelivery count:" + m);
        }
        connection.close();
        connections.remove(connection);
    }

    // We should be able to get the message off the DLQ now.
    TextMessage m = (TextMessage)dlqConsumer.receive(1000);
    System.out.println("Got message from DLQ:" + m);
    System.out.println("Text:"+ m.getText());
    String cause = m.getStringProperty(ActiveMQMessage.DLQ_DELIVERY_FAILURE_CAUSE_PROPERTY);
    System.out.println("cause exception has policy ref:" +  cause.contains("RedeliveryPolicy"));
    dlqSession.commit();
}